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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 17 · 40 questions
TalentJR

The fast method (Shift both): How much makes the second number round? 68 needs 2 to make 70. Add that amount to BOTH numbers. Take away the round number.

NameDateTime takenScore ___ / 40
  1. 1.175 − 19 =
  2. 2.175 − 97 =
  3. 3.377 − 89 =
  4. 4.79 − 56 =
  5. 5.169 − 87 =
  6. 6.152 − 97 =
  7. 7.345 − 16 =
  8. 8.501 − 17 =
  9. 9.344 − 97 =
  10. 10.359 − 19 =
  11. 11.223 − 16 =
  12. 12.590 − 17 =
  13. 13.200 − 37 =
  14. 14.273 − 59 =
  15. 15.222 − 69 =
  16. 16.288 − 97 =
  17. 17.464 − 36 =
  18. 18.376 − 18 =
  19. 19.356 − 26 =
  20. 20.475 − 47 =
  21. 21.136 − 17 =
  22. 22.535 − 26 =
  23. 23.338 − 38 =
  24. 24.314 − 79 =
  25. 25.313 − 78 =
  26. 26.477 − 39 =
  27. 27.165 − 28 =
  28. 28.574 − 47 =
  29. 29.380 − 86 =
  30. 30.162 − 86 =
  31. 31.266 − 47 =
  32. 32.134 − 46 =
  33. 33.162 − 49 =
  34. 34.89 − 17 =
  35. 35.239 − 37 =
  36. 36.547 − 39 =
  37. 37.161 − 97 =
  38. 38.329 − 69 =
  39. 39.127 − 68 =
  40. 40.311 − 68 =

Answer key

  1. 156
  2. 78
  3. 288
  4. 23
  5. 82
  6. 55
  7. 329
  8. 484
  9. 247
  10. 340
  11. 207
  12. 573
  13. 163
  14. 214
  15. 153
  16. 191
  17. 428
  18. 358
  19. 330
  20. 428
  21. 119
  22. 509
  23. 300
  24. 235
  25. 235
  26. 438
  27. 137
  28. 527
  29. 294
  30. 76
  31. 219
  32. 88
  33. 113
  34. 72
  35. 202
  36. 508
  37. 64
  38. 260
  39. 59
  40. 243

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